#include "Date.h"

	void Date::Print()
	{
		cout << _year << "-" << _month << "-" << _day << endl;
	}

	int Date::GetMonthDay(int year, int month)
	{
		if (month == 2)
		{
			if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
			{
				return 29;
			}
			else
			{
				return 28;
			}
		}
		else if (month == 4 || month == 6 || month == 9 || month == 11)
		{
			return 30;
		}
		else
		{
			return 31;
		}
	}

	Date::Date(int year, int month, int day)
	{
		_year = year;
		_month = month;
		_day = day;
	}

	Date::Date(const Date& d)
	{
		_year = d._year;
		_month = d._month;
		_day = d._day;
	}

	Date& Date::operator=(const Date& d)
	{
		_year = d._year;
		_month = d._month;
		_day = d._day;
		return *this;
	}

	Date::~Date()
	{
		_year = 0;
		_month = 0;
		_day = 0;
	}


	Date& Date::operator+=(int day)
	{
		_day += day;
		while (_day > GetMonthDay(_year, _month))
		{
			_day -= GetMonthDay(_year, _month);
			_month++;
			if (_month > 12)
			{
				_year++;
				_month = 1;
			}
		}
		return *this;
	}

	Date Date::operator+(int day)
	{
		Date d;
		d = *this;
		d._day += day;
		while (d._day > GetMonthDay(d._year, d._month))
		{
			d._day -= GetMonthDay(d._year, d._month);
			d._month++;
			if (d._month > 12)
			{
				d._year++;
				d._month = 1;
			}
		}
		return d;
	}

	Date Date::operator-(int day)
	{
		Date d;
		d = *this;
		d._day -= day;
		while (d._day <= 0)
		{
			d._day += GetMonthDay(d._year, (d._month) - 1);
			d._month--;
			if (d._month <= 0)
			{
				d._year--;
				d._month = 12;
			}
		}
		return d;
	}

	Date& Date::operator-=(int day)
	{
		_day -= day;
		while (_day <= 0)
		{
			_day += GetMonthDay(_year, (_month) - 1);
			_month--;
			if (_month <= 0)
			{
				_year--;
				_month = 12;
			}
		}
		return *this;
	}

	Date& Date::operator++()
	{
		*this += 1;
		return *this;
	}

	Date Date::operator++(int)
	{
		Date d = *this;
		*this += 1;
		return *this;
	}

	Date& Date::operator--()
	{
		*this -= 1;
		return *this;
	}

	Date Date::operator--(int)
	{
		Date d = *this;
		*this += 1;
		return *this;
	}

	bool Date::operator>(const Date& d)
	{
		if (_year > d._year)
		{
			return true;
		}
		else if (_year == d._year)
		{
			if (_month > d._month)
			{
				return true;
			}
			else if (_month == d._month)
			{
				if (_day > d._day)
				{
					return true;
				}
			}
		}
		return false;
	}

	bool Date::operator==(const Date& d)
	{
		return _year == d._year && _month == d._month && _day == d._day;
	}

	bool Date::operator >= (const Date& d)
	{
		return *this > d || *this == d;
	}

	bool Date::operator < (const Date& d)
	{
		return !(*this >= d);
	}

	bool Date::operator <= (const Date& d)
	{
		return *this < d || *this == d;
	}
	bool Date::operator != (const Date& d)
	{
		return !(*this == d);
	}

	int Date::operator-(const Date& d)
	{
		int falg = 1;
		Date max = *this;
		Date min = d;
		if (*this < d)
		{
			max = d;
			min = *this;
			falg = -1;
		}
		int n = 0;
		while (max != min)
		{
			++min;
			++n;
		}
		return n * falg;
	}
